Solar tower



FIG. 1 shows a perspective view of a solar tower design;

FIG. 2 shows a front elevation view thereof;

FIG. 3 shows a rear elevation view thereof;

FIG. 4 shows a right side elevation view thereof;

FIG. 5 shows a left side elevation view thereof;

FIG. 6 shows a top plan view thereof; and,

FIG. 7 shows a bottom plan view thereof. 

The ornamental design for a solar tower, substantially as shown and described. 